/**
 *
 *  Copyright (c) 2011, AstroDAbis
 *  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without modification,
 *  are permitted provided that the following conditions are met:
 *
 *      * Redistributions of source code must retain the above copyright notice,
 *        this list of conditions and the following disclaimer.
 *      * Redistributions in binary form must reproduce the above copyright notice,
 *        this list of conditions and the following disclaimer in the documentation
 *        and/or other materials provided with the distribution.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 *  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 *  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 *  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 *  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 *  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 *  OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 *  OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */
package org.jiscinvolve.astrodabis.mallow.control.upload;

import java.io.File;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.LineNumberReader;
import java.io.IOException;

import java.util.Date;
import java.text.DateFormat;
import java.text.SimpleDateFormat;

import javax.validation.Valid;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.stereotype.Controller;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.context.request.WebRequest;

import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ModelAttribute;

import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional; 

import org.springframework.validation.FieldError;
import org.springframework.validation.ObjectError;
import org.springframework.validation.BindingResult;

import org.jiscinvolve.astrodabis.mallow.model.api.Query;
import org.jiscinvolve.astrodabis.mallow.model.api.QueryBean;
import org.jiscinvolve.astrodabis.mallow.model.api.Account;
import org.jiscinvolve.astrodabis.mallow.model.jpa.DuplicateEntryException;

import org.jiscinvolve.astrodabis.mallow.control.ViewData;
import org.jiscinvolve.astrodabis.mallow.control.BaseController;
import org.jiscinvolve.astrodabis.mallow.control.NotFoundException;
import org.jiscinvolve.astrodabis.mallow.control.PermissionException;

/**
 * Upload data to the server. 
 *
 */
@Controller
@RequestMapping("/upload/test")
public class UploadDataController
extends BaseController
    {

    /**
     * Our debug logger.
     * 
     */
    private static Log log = LogFactory.getLog(UploadDataController.class);

    /**
     * The form view (JSP) path.
     * 
     */
    public static final String FORM_VIEW = "upload/upload-form" ;

    /**
     * The done view (JSP) path.
     * 
     */
    public static final String DONE_VIEW = "upload/upload-done" ;

    /**
     * The form data (bean) attribute name.
     * 
     */
    public static final String FORM_DATA = "bean" ;

    /**
     * Create the UploadData for this request.
     *
     */
    @ModelAttribute(ViewData.VIEW_DATA)
    public UploadData data(
        WebRequest request
        ){
        return new UploadData(
            request,
            this.actor(
                request
                )
            );
        }

    /**
     * Get the form.
     * 
     */
	@RequestMapping(method=RequestMethod.GET)
	public ModelAndView page(
	    @ModelAttribute(ViewData.VIEW_DATA) UploadData data,
	    ModelAndView model
	    ){
        log.debug("UploadDataController.page(....)");
        //
        // Check we are logged in.
        if (data.actor() == null)
            {
            throw new PermissionException();
            }
        //
        // Add an empty bean to our model.
        model.addObject(
            FORM_DATA,
            new UploadBean()
            );
        model.setViewName(
		    FORM_VIEW
            );
        return model;
        }

    /**
     * Post the form.
     * 
     */
	@RequestMapping(method=RequestMethod.POST)
	public String post(
	    @ModelAttribute(FORM_DATA) @Valid UploadBean bean, BindingResult result,
	    @ModelAttribute(ViewData.VIEW_DATA) UploadData data,
	    ModelAndView model
	    ){
        log.debug("UploadDataController.post(....)");
        //
        // Check we are logged in.
        if (data.actor() == null)
            {
    		return data.redirect();
    		}
        //
        // If the input is not valid, re-display the form page.
	    if (result.hasErrors())
	        {
    		return FORM_VIEW ;
	        }
        //
        // Add the uploaded file data to our model.
        try {

            data.bean(
                bean
                );
            
    		return DONE_VIEW ;

            }
        //
        // Anything goes wrong, add an error and re-display the form page.
        catch (Throwable ouch)
            {
            log.error("Exception while processing file [" + ouch.getClass().getName() + "][" + ouch.getMessage() + "]");
            result.addError(
                new ObjectError(
                    FORM_DATA,
                    "Operation failed due to technical problems, please try again later"
                    )
                );
    		return FORM_VIEW ;
            }
        }

    /**
     * Process an uploaded file.
     *
     */
    public void process(UploadBean bean)
    throws IOException
        {

        log.debug("Processing upload data ...");

        log.debug("Name [" + bean.getName() + "]");
        log.debug("Name [" + bean.getData().getOriginalFilename() + "]");
        log.debug("Size [" + bean.getData().getSize() + "]");

        InputStream stream = bean.getData().getInputStream();
        if (null != stream)
            {
            log.debug("Got stream");
            LineNumberReader reader = new LineNumberReader(
                new InputStreamReader(
                    stream
                    )
                );

            log.debug("Reading data");
            String string = reader.readLine();
            while (string != null)
                {
                int count = reader.getLineNumber();
                log.debug("Line [" + count + "][" + string + "]");
                string = reader.readLine();
                }
            log.debug("Done reading");

            }
        else {
            log.error("NULL stream");
            }

/*
 * http://static.springsource.org/spring/docs/3.0.x/javadoc-api/org/springframework/web/multipart/commons/CommonsMultipartFile.html
 * CommonsMultipartFile
 * public void transferTo(File dest)
 * File temp = File.createTempFile("temp-file-name", ".tmp"); 
 *
 */

        }
    }

